How to embed an optin form at the end of Each Posts?

Hi Guys!
I am using ecopro theme and I am wondering how I should embed the optin form at the end of each post with php coding as it showing in the example site below.
ranashahbaz.com
Your Quick Response will be highly appreciated!
Regards,
btltimes,

Thank Catrina for answering.
You can check the following screen cast which will give you an idea what I am refferring to;
http://screencast.com/t/yaQGKGnK0zcH
its not a comment form its an optin form before the author box.
Please give me any tutorial regarding this, I really need it to embed in to my site.
Regards,
btltimes.

You'll need an e-mail newsletter client to have that kind of option form. There are various kinds, but it's a matter of finding one that works best for you. For example, the one on the site you gave is from http://www.aweber.com, but this isn't free. There are free options, though, if you search for e-mail subscription services on Google. One free option I know of is available from http://www.madmimi.com.

Dear Catrina.
I am using Aweber form for my site's but I want to embed that form in ecopro theme.
What I am looking to help from you, "is that how should I embed that form at the end of each post".
It will be great if you guide me in this regard,
Thank you & Regards,
btltimes.

You cannot edit template files in EcoPro directly. If you do, the changes will be lost when you upgrade the theme because the old files will be overwritten by the new ones. In order to add the e-mail subscription form in each post page, you'll need to create a child theme based on EcoPro so that you can edit the files in there without worrying about losing the changes when you upgrade. For further reference on child themes, please see here: http://codex.wordpre...rg/Child_Themes